Anyone know where to purchase a converter to take a 3 rotor tachometer output to a 2 rotor tach? I have the Wolf EMS and after my 20B conversion, the tach is off. I've heard old shool auto parts shops have these but I have no idea where to look.

 

Dakota Digital makes one.

http://www.dakotadigital.com/Detail....-8/product.htm

 

Two options are listed at the bottom of the links page:
https://www.rx7club.com/20b-forum-95/20b-faq-links-370451/

 

I use the Dakota Digital. It is off by 45 rpms or so compared to what the Microtech displays.

 

Thanks for the info guys. I wasn't quite sure how to search for this on the forum so I appreciate it.

 

I'm working on a different solution to the same problem. I'd be able to hook my stock tach wire to one of the leading coils and it would read correctly IF that coil sparks twice per revolution. Unfortunately, no aftermarket EMS can do this in 20B mode as far as I know (neither can the stock ECU for that matter).

 

You've got very few options...

1) Run a 6-cylinder aftermarket tach
2) Run an adapter box to modify the tach signal
3) Get an FC and crank the tach adjustment screw all the way over.


-Ted

 

Thanks guys. I ordered the Dakota Digital unit and I'm having it installed this Wednesday down at Pettit Racing where I'm getting the final tuning and dynos done.

 

I'm messing around with sparking each leading plug twice per revolution. It's my poor man's tach corrector.